sql习题及答案

精选文库题1、 查询Student表中的所有记录的Sname、Ssex和Class列。2、 查询教师所有的单位即不重复的Depart列。3、 查询Student表的所有记录。4、 查询Score表中成绩在60到80之间的所有记录。5、 查询Score表中成绩为85，86或88的记录。6、 查询Student表中“95031”班或性别为“女”的同学记录。7、 以Class降序查询Student表的所有记录。8、 以Cno升序、Degree降序查询Score表的所有记录。9、 查询“95031”班的学生人数。10、查询Score表中的最高分的学生学号和课程号。11、查询3-105号课程的平均分。12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。13、查询最低分大于70，最高分小于90的Sno列。14、查询所有学生的Sname、Cno和Degree列。15、查询所有学生的Sno、Cname和Degree列。16、查询所有学生的Sname、Cname和Degree列。17、查询“95033”班所选课程的平均分。18、假设使用如下命令建立了一个grade表：create table grade(low numeric(3,0),upp numeric(3),rank char(1);insert into grade values(90,100,A);insert into grade values(80,89,B);insert into grade values(70,79,C);insert into grade values(60,69,D);insert into grade values(0,59,E);现查询所有同学的Sno、Cno和rank列。19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录。21、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。23、查询“张旭“教师任课的学生成绩。24、查询选修某课程的同学人数多于5人的教师姓名。25、查询95033班和95031班全体学生的记录。26、查询存在有85分以上成绩的课程Cno.27、查询出“计算机系“教师所教课程的成绩表。28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree.31、查询所有教师和同学的name、sex和birthday.32、查询所有“女”教师和“女”同学的name、sex和birthday.33、查询成绩比该课程平均成绩低的同学的成绩表。34、查询所有任课教师的Tname和Depart.35 查询所有未讲课的教师的Tname和Depart.36、查询至少有2名男生的班号。37、查询Student表中不姓“王”的同学记录。38、查询Student表中每个学生的姓名和年龄。39、查询Student表中最大和最小的Sbirthday日期值。40、以班号和年龄从大到小的顺序查询Student表中的全部记录。41、查询“男”教师及其所上的课程。42、查询最高分同学的Sno、Cno和Degree列。43、查询和“李军”同性别的所有同学的Sname.44、查询和“李军”同性别并同班的同学Sname.45、查询所有选修“计算机导论”课程的“男”同学的成绩表下面是参考答案：SQL语句练习题参考答案1.select sname,ssex,class from student;2.select distinct(depart) from teacher;orselect distinct depart from teacher;3.select * from student; 4.select * from score where degree between 60 and 80; orselect * from score where degree=60 and degree5;orselect cno,avg(degree) from score where cno like 3% group by cno having count(*)5;13.select sno from score group by sno having min(degree)70 and max(degree)(select degree from score where sno=109 and cno=3-105);orselect x.* from score x,score y where o=3-105 and x.degreey.degree and y.sno=109 and o=3-105;20.分析：1.成绩非本科最高select * from score where degree not in (select max(degree) from score group by cno) 选学一门以上的学生成绩：select sno from score group by sno having count(*)1; 2.查询成绩非本科最高并且选1门以上的学生的成绩:select * from score where degree not in(select max(degree) from score group by cno) group by sno having count(*)1;orselect * from (select * from score where degree not in(select max(degree) from score group by cno) as aa group by sno having count(*)=2;通用答案：select sno from (select * from score where degree not in (select max(degree) from score group by cno) as aa group by sno having count(*)=2;21.select * from score where degree(select degree from score where sno=109 and cno=3-105);orselect x.* from score x,score y where x.degreey.degree and y.sno=109 and o=3-105;22.select sno,sname,sbirthday from student where year(sbirthday)=(select year(sbirthday) from student where sno=108);23.select * from score where cno in(select cno from course where tno=(select tno from teacher where tname=张旭);orselect cno,sno,degree from score where cno=(select o from course x,teacher y where x.tno=y.tno and y.tname=张旭);24.select tname from teacher where tno in (select x.tno from course x,score y where o=o and o in (select cno from score group by cno having count(*)5);orselect tname from teacher where tno in(select tno from course where cno in(select cno from score group by cno having count(*)5);orselect tname from teacher where tno in(select x.tno from course x,score y where o=o group by x.tno having count(x.tno)5);25. select * from student where class in (95033,95031);orselect * from student where class=95033 or class=95031;26.select distinct cno from score where degree in (select degree from score where degree85);27.select * from score where cno in (select cno from course where tno in (select tno from teacher where depart=计算机系);orselect * from score where cno in(select o from course x,teacher y where y.tno=x.tno and y.depart=计算机系);28.select tname,prof from teacher where depart=计算机系 and prof not in (select prof from teacher where depart=电子工程系);29.select * from score where cno=3-105 and degree(select min(degree) from score where cno=3-245) order by degree desc;orselect * from score where cno=3-105and degreeany(select degree from score where cno=3-245) order by degree desc;30.select * from score where cno=3-105 and degree(select max(degree) from score where cno=3-245);orselect * from score where cno=3-105 and degreeall(select degree from score where cno=3-245);31.select sname as name,ssex as sex,sbirthday as birthday from studentunionselect tname,tsex,tbirthday from teacher;32.select sname as name,ssex as sex,sbirthday as birthday from student where ssex=女unionselect tname,tsex,tbirthday from teacher where tsex=女;33.select * from score a where degree=2;37. select * from student where sname not like 王%;38.select sname as 姓名,2010-year(sbirthday) as 年龄 from student;39. select sbirthday from student where sbirthday in (select min(sbirthday) from student) union select sbirthday from student where sbirthday in (select max(sbirthday) from student);orselect sbirthday from student where sbirthday=(select min(sbirthday) from student) or sbirthday=(select max(sbirthday) from student);40.select * from student order by class desc,sbirthday;41. select cname,tname from course,teacher where course.tno=teacher.tno and tsex=男;orselect ame,teacher.tname from course,teacher where course.tno=teacher.tno and tsex=男;orselect cname,tname from course x,t